Au/Ag–Mo nano-rods catalyzed reductive coupling of nitrobenzenes and alcohols using glycerol as the hydrogen source
作者:Xinjiang Cui、Chengming Zhang、Feng Shi、Youquan Deng
DOI:10.1039/c2cc34178f
日期:——
A highly efficient Au/AgâMo nano-rods catalyst was prepared for the one-pot synthesis of imine and amine using equal molar ratio of nitrobenzene and alcohol as starting materials, and bio-based glycerol as the hydrogen source. The reaction mechanism of the nitrobenzene reduction, amine and aldehyde coupling, and imine reduction was explored.
Osmium Hydride Acetylacetonate Complexes and Their Application in Acceptorless Dehydrogenative Coupling of Alcohols and Amines and for the Dehydrogenation of Cyclic Amines
作者:Miguel A. Esteruelas、Virginia Lezáun、Antonio Martínez、Montserrat Oliván、Enrique Oñate
DOI:10.1021/acs.organomet.7b00521
日期:2017.8.14
presence of 5 mol % of KOH, complexes 3–6 promote the coupling of benzylalcohol and aniline to give N-benzylideneaniline and H2. Under the same conditions, complex 3 catalyzes a wide range of analogous couplings to afford a variety of imines, including aliphatic imines, with yields between 90 and 40% after 1–48 h. Complex 3 also catalyzes the dehydrogenation of cyclic amines. According to the amount
从OsH 6(P i Pr 3)2(1)和OsH 2 Cl 2(P i Pr 3)2(2)开始制备新的氢化配合物,以及它们在醇和胺的无受体脱氢偶联中的催化活性并报道了环胺的脱氢。配合物1与乙酰丙酮(Hacac)反应,得到经典的三氢化物OsH 3(acac)(P i Pr 3)2(3)。3的质子化用三氟甲磺酸(HOTf)产生H 2的释放并形成不饱和二氢os(IV)[OsH 2(acac)(P i Pr 3)2 ] OTf(4),也可以从2开始通过中间体OsH 2 Cl(acac)(P i Pr 3)2(5)。用KOH处理5的乙酰丙酮溶液,得到Os(acac)2(P i Pr 3)2(6)。在5摩尔%的KOH存在下,络合物3– 6促进苄醇和苯胺的偶联,得到N-苄叉基苯胺和H 2。在相同条件下,配合物3催化多种类似的偶合反应,从而提供各种亚胺,包括脂肪族亚胺,在1–48小时后收率在90%至40%
Asymmetric Petasis Borono‐Mannich Allylation Reactions Catalyzed by Chiral Biphenols
作者:Yao Jiang、Scott E. Schaus
DOI:10.1002/anie.201611332
日期:2017.2
Chiral biphenols catalyze the asymmetric Petasis borono‐Mannich allylation of aldehydes and amines through the use of a bench‐stable allyldioxaborolane. The reaction proceeds via a two‐step, one‐pot process and requires 2–8 mole % of 3,3′‐Ph2‐BINOL as the optimal catalyst. Under microwave heating the reaction affords chiral homoallylic amines in excellent yields (up to 99 %) and high enantioselectivies
Direct Access to POP-Type Osmium(II) and Osmium(IV) Complexes: Osmium a Promising Alternative to Ruthenium for the Synthesis of Imines from Alcohols and Amines
作者:Miguel A. Esteruelas、Nicole Honczek、Montserrat Oliván、Enrique Oñate、Marta Valencia
DOI:10.1021/om200290u
日期:2011.5.9
easy and direct access to POP-type osmium(II) and osmium(IV) complexes, including OsH4dbf(PiPr2)2} (dbf(PiPr2)2 = 4,6-bis(diisopropylphosphine)dibenzofuran), is reported. This tetrahydride derivative is an efficient catalyst for the selective formation of imines fromalcohols and amines with liberation of H2, proving that osmium is a promising alternative to ruthenium for catalysis.
轻松直接访问POP型(II)和(IV)络合物,包括OsH 4 dbf(P i Pr 2)2 }(dbf(P i Pr 2)2 = 4,6-双(二异丙基膦) )二苯并呋喃)。该四氢化物衍生物是从醇和胺中选择性释放出H 2选择性地形成亚胺的有效催化剂,证明是钌的理想替代催化剂。
Imidazolium-based ionic liquid-catalyzed hydrosilylation of imines and reductive amination of aldehydes using hydrosilane as the reductant
作者:Bin Li、Shilin Zhang、Weizhen Wu、Lecheng Liang、Shaohua Jiang、Lu Chen、Yibiao Li
DOI:10.1039/c7ra04245k
日期:——
The first imidazolium-based ionic liquid-catalyzed hydrosilylation of imine and reductiveamination of aldehydes with primary amines using a catalytic amount of 1-butyl-3-methylimidazolium tetrachloride iron [BMIm][FeCl4] and Ph2SiH2 as a reductant were performed under mild conditions. Good yields of secondary amines with high chemoselectivity and a tolerance for a wide range of functional groups were